Earn $20 Cash Back from WU® Pay on Gift Cards or on purchases at participating retailers. On qualified orders. See details. First time buyers earn $20 Cash Cash Back from WU® Pay on qualified Gift Card orders, or purchases at participating retailers. Spend $100 or more on your first order with WU® Pay at the WU Pay Gift Card Mall or participating retailers, and earn $20 in cash back rewards! Offer expires on June 30, 2012. Restrictions apply, see promotion terms.